I can sympathize with solodon.  When I first started buying content I ran into the base product requirement.  Some of the texture artist work is so good that they're actually beautiful.  In some cases it made me re-evaluate the base product, and the purchase was made based on the texture artists work. solodon could have very well requested a refund.

For new users, there should be some sort of introduction when they activate their account.  Some sites even list a placeholder indicating compatibility with a product not provided by the site (especially for Photoshop stuff). 

After buying content for several years, I'm glad they still sell textures for discontinued products, especially for AerySoul.